is this the next big thing? >> well, we think it is the next big thing. we want to prevent crashes before they happen if we can and technology like volvo's city safety that can help drivers to avoid crashes. >> reporter: by comparing insurance claims from volvos that are equipped with city safety to other cars that are not, the institute determined that the system eliminates more than a quarter of low-speed crashes. >> there is always the risk that the technology could make a mistake, but it's much more likely that a human could make a mistake because we're all so easily distracted. >> reporter: volvo will stake city safety standard in four models by 2012. meanwhile, other car companies are racing to bring their own futuristic self-braking technology into the present. for "good morning amamica," elisabeth leamy, abc news, rutgersville, virginia. >> and here's diane sawyer with a preview of "world news." >> tonight we are going to continue to crack the code for a happy retirement. the rules rewritten, boomers setting all those goals. tonight, how some marr